The ASSIST (Alcohol, Smoking, and Substance Involvement Screening Test) is an 8 - item questionnaire designed to be
administered by a health worker to a client using paper and pencil, and takes about 5 - 10 minutes to administer.
But the Yemeni government, with the help of a Saudi - led coalition, is battling Shiite Houthi rebels backed
by Iran and there were concerns over whether the vaccine could be used effectively as battles raged in parts of the country, and whether
administering it might distract
health workers from treating patients, a cornerstone of epidemic response.